1、Designation:A879/A879M06 Designation: A879/A879M 12Standard Specification forSteel Sheet, Zinc Coated by the Electrolytic Process forApplications Requiring Designation of the Coating Mass onEach Surface1This standard is issued under the fixed designation A879/A879M; the number immediately following
2、the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification co
3、vers zinc coatings applied by the electrolytic process to hot-rolled and cold-rolled steel sheet. Thecoating has a smooth, spangle-free surface. The zinc-coated sheet covered in this specification is produced in a wide range ofcoating masses to provide coatings that are compatible with the anticipat
4、ed service life required. The coating mass varies, fromvery thin coatings that are usually painted to provide good service, to relatively heavy masses that provide good corrosionresistance in the bare (unpainted) condition.1.2 The product shall be coated on one or both surfaces with equal or differe
5、ntial coating masses on the two surfaces. Sheetcoated with equal coating masses on each surface has similar levels of corrosion protection on each surface. Often, however, ahigher level of corrosion protection is required on one surface than is required on the other. Thus one surface is specified to
6、 havea heavier coating mass than the other. Either surface, when specified to be painted will provide additional corrosion protection ascompared to an unpainted surface.1.3This1.3 This coating process has essentially no effect on the base metal mechanical properties and use is permitted on anygrade
7、of hot- or cold-rolled steel sheet. The coated sheet is available as Commercial Steel (CS), Drawing Steel (DS), Deep DrawingSteel (DDS), Extra-Deep Drawing Steel (EDDS), Structural Steel (SS), High-Strength Low-Alloy Steel (HSLAS), High-StrengthLow-Alloy Steel with Improved Formability (HSLAS-F), So
8、lution-Hardened Steel (SHS), or Bake-Hardenable Steel (BHS), seeSpecifications A1008/A1008M and A1011/A1011M.1.4 The values stated in either SI or inch-pound units are to be regarded separately as the standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are
9、not exact equivalents; therefore, each system must be usedindependently of the other.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA754/A754M Test Method for Coating Weight (Mass) of Metallic Coat
10、ings on Steel by X-Ray FluorescenceA917 Specification for Steel Sheet, Coated by the Electrolytic Process for Applications Requiring Designation of the CoatingMass on Each Surface (General Requirements)A1008/A1008M Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Al
11、loy, High-StrengthLow-Alloy with Improved Formability, Solution Hardened, and Bake HardenableA1011/A1011M Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High StrengthB504 Test Method for
12、Measurement of Thickness of Metallic Coatings by the Coulometric Method3. Classification3.1 Coating shall be designated in accordance with Specification A917. The letter G shall be used to designate SI units of purezinc coatings. The letter Z shall be used to designate inch-pound units of pure zinc
13、coating.1This specification is under the jurisdiction of ASTM CommitteeA05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of SubcommitteeA05.11on Sheet Specifications.Current edition approved Nov.May 1, 2006.2012. Published December 2006.June 2012. Originally approved in
14、 1987. Last previous edition approved in 20042006 asA879/A879M - 046. DOI: 10.1520/A0879_A0879M-0612.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards
15、Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, A
16、STM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive,
17、PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Ordering Information4.1 Orders for products to this specification shall include the following information, as necessary to adequately describe thedesired product:4.1.1 Name of product (electrolytic zinc-coated steel sheet).4.1.2 ASTM de
18、signation and year of issue.4.1.3 Base metal type (hot rolled or cold rolled).4.1.4Base4.1.4 Base metal designation (Commercial Steel (CS), Drawing Steel (DS), Deep Drawing Steel (DDS), Extra DeepDrawing Steel (EDDS), Structural Steel (SS), High-Strength Low-Alloy Steel (HSLAS), High-Strength Low-Al
19、loy Steel withImproved Formability (HSLAS-F), Solution-Hardened Steel (SHS), or Bake-Hardenable Steel (BHS).4.1.5 Formability type, strength, grade or class, or combination, thereof, as required for structural or high-strength low-alloysteels.4.1.6 Coating designation (see 3.1).4.1.7 Surface treatme
20、nts required (see Note 1).NOTE 1Steel sheet is available without surface treatment (dry) or with surface treatments designated as chemical treatment, oiled, or phosphatized.Unless otherwise specified sheet is furnished oiled.4.1.8 Dimensions show thickness (minimum or nominal), width, and length, if
21、 cut length.4.1.9 Coil size requirements (specify maximum outside diameter (OD), acceptable inside diameter (ID), and maximum weight(mass).4.1.10 Application (part name and description).4.1.11 Special Requirements, is applicable.4.1.12 Certification, if required, heat analysis and mechanical propert
22、y report.5. Coating Mass5.1 Coating mass shall conform to the requirements for coating designation (mass and type) as given in Specification A917 andin Table 1 for the specific coating designation. The mass of the coating is the single spot value on each surface of the sheet in gramsper square metre
23、 for G coatings and ounces per square foot for Z coatings.5.2 Coating Mass Tests:5.2.1 The weigh-strip-weigh method (see Test Method A90/A90M) is a destructive test that determines coating mass bymeasuring the difference in weight between a coated and a stripped (uncoated) sample. If one surface is
24、protected suitably duringthe initial stripping, coating mass can be determined for each surface independently. Conversion of the coating mass to coatingthickness is possible only if the density of the coating is known precisely.5.2.2 Coating thickness measurements by X-ray fluorescence (see Test Met
25、hod A754/A754M) is a nondestructive test thatdetermines coating mass by converting X-ray fluorescence measurements to coating mass values. This method is readily adaptableto the continuous monitoring of coating mass during coating. Thus modern electroplating facilities are frequently equipped withX-
26、ray fluorescence gages that provide feedback to control the coating mass. These devices may be used as a basis for determiningsuitability for shipment provided that they have been calibrated properly.5.2.3 Measurement by Coulometric Method (see Test Method B504) is a destructive test that determines
27、 lighter coating massapplications.5.3 The referee method to be used shall be as agreed upon between the producer and the consumer. In the absence of suchTABLE 1 Coating Weight and Mass per Surface,Afor Steel Sheet, Zinc Coated by the Electrolytic ProcessBInch-Pound Units, oz/ft2SI Units, g/m2Coating
28、 DesignationCMinimum Maximum Coating DesignationCMinimum Maximum00Z no coating no coating 00G no coating no coating01ZD0.01 0.05 03GD31502ZE0.02 0.08 06GE6204ZF0.04 0.10 12GF12 3007Z 0.07 0.13 20G 20 4008ZG0.08 0.16 24GG24 4513Z 0.13 0.23 40G 40 7016Z 0.16 0.26 50G 50 8020Z 0.20 0.30 60G 60 9023Z 0.
29、23 0.36 70G 70 11030Z 0.30 0.43 90G 90 13032Z 0.32 0.46 98G 98 140AConversion for coating weight and mass are: 1 oz/ft2= 305.15 g/m2and1g/m2= 0.00328 oz/ft2.BThe product shall be coated on at least one surface; therefore, the combination 00Z/00Z or 00G/00G shall not be specified.CSee Specification A
30、917.DFormally Flash CoatingEFormally Intermediate CoatingFFormally Full CoatingGFormally Double CoatingA879/A879M 122agreement, Test Method A90/A90M shall be used as the referee method.5.3.1 Estimate the coating thickness from the coating weight (mass) by using the following relationships:5.3.1.1 In
31、ch-Pound Units1 oz/ft2coating weight = 1.7 mils coating thickness (0.0017 in.); 1 mil (0.001 in.) coatingthickness = 0.59 oz/ft2coating weight.5.3.1.2 SI Units1 g/m2coating mass = 0.14 micro-metre coating thickness; 1 micro-metre coating thickness = 7.14 g/m2coating mass.6. Keywords6.1 electrolytic
32、zinc coated; steel sheet, zinc coated; zinc coated; zinc coated steel sheetSUMMARY OF CHANGESCommittee A05 has identified the location of selected changes to this standard since the last issue(A879/A879M - 046) that may impact the use of this standard. (November(May 1, 2006) 2012)(1)Revised 1.3, 2.1
33、, and 4.1.4 to include Solution-Hardened Steel (SHS) and Bake-Hardenable Steel (BHS) designations. ) Addedcoating designation 50G and 16Z to Table 1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users
34、 of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every f
35、ive years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical
36、 committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
37、PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A879/A879M 123
